Let us suppose that an adequately hot mixture is delivered to the job site. Nevertheless, badly adjusted paver elements (in the given examples, badly arranged screed segments) may bring about the formation of porous areas in the course (streaks). Figure 11.13 presents an example of streaks pulled by a paver during laying. Figure 11.14 presents the same effect but photographed with an infrared camera.
One of the main principles of laying SMA is avoiding a paver standstill. Almost every time the paver is immobile, uncompacted areas behind the machine are the result (Figure 11.15). This effect is heightened if the mixture contains modified binder (higher stiffening of the mixture during cooling down). Figure 11.16a and b presents infrared camera photos of mixture cooling down during a paver standstill.
